The preload URL param shouldn't be used in SPA mode, so ignore it if not in widget (#2832)

* Refactor URL parameters into table

This is for readability and ahead of some possible changes

* Whitespace

* Lint

* The preload URL param shouldn't be used in SPA mode, so ignore it

src/UrlParams.test.ts

@@ -7,7 +7,7 @@ Please see LICENSE in the repository root for full details.
 
 import { describe, expect, it } from "vitest";
 
-import { getRoomIdentifierFromUrl } from "../src/UrlParams";
+import { getRoomIdentifierFromUrl, getUrlParams } from "../src/UrlParams";
 
 const ROOM_NAME = "roomNameHere";
 const ROOM_ID = "!d45f138fsd";
@@ -86,4 +86,18 @@ describe("UrlParams", () => {
         .roomAlias,
     ).toBeFalsy();
   });
+
+  describe("preload", () => {
+    it("defaults to false", () => {
+      expect(getUrlParams().preload).toBe(false);
+    });
+
+    it("ignored in SPA mode", () => {
+      expect(getUrlParams("?preload=true").preload).toBe(false);
+    });
+
+    it("respected in widget mode", () => {
+      expect(getUrlParams("?preload=true&widgetId=12345").preload).toBe(true);
+    });
+  });
 });